Re: port-alpha/38335 (kernel freeze on alpha MP system)

[Jarle Greipsland <jarle%uninett.no@localhost>]

dholland%NetBSD.org@localhost writes:
> Synopsis: kernel freeze on alpha MP system
> 
> State-Changed-From-To: open->feedback
> State-Changed-By: dholland%NetBSD.org@localhost
> State-Changed-When: Sat, 19 Sep 2009 21:51:28 +0000
> State-Changed-Why:
> A bunch of MP alpha fixes just went into -current; might want to give them a
> try.
The problem is still there.  I installed and booted GENERIC.MP,
and built a full release.  During extraction of the newly built
sets, the system wedged again.  This time I could not break into
DDB from the console.

I power-cycled the system, and started to extract the sets again.
During extraction I noticed that the IO performance through the
file system seemed abyssmal (according to 'systat vm').  The 'tar
zxBpf' command consumed almost no CPU, but the disk IO hovered
around 500KB/s.  Doing a plain dd from/to a single file on the
same disk gets around 20-30MB/s.

Also, right after root file system detection, the kernel complains:

WARNING: negative runtime; monotonic clock has gone backwards

I don't know if this might be related to the wedging or not.

If you want me to dig out more information, please ask, and I'll
see what I can do.
                                        -jarle